RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Article
Verification Tests on Nondestructive Assay for 238U Content in Uranium-contaminated Waste Drums Using Gamma Method
Kaoru YOKOYAMANoritake SUGITSUEMasayuki MUROIYasuo SUZUKI
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JOURNALS OPEN ACCESS

2013 Volume 62 Issue 1 Pages 1-17

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Abstract

We have proposed a new theory on gamma assay for 238U determination of uranium-contaminated waste drums. According to this theory, regardless of the inhomogeneity of waste matrix density or uranium source distribution, we can accurately determine the amount of 238U contained in drums nondestructively using count rates of gamma rays of two energies(1001keV and 766keV) emitted from 238U progeny nuclide 234mPa. In this paper, we have verified the theory by tests under various waste conditions made by simulated waste drums. We have estimated the relative error to be less than 20%, and the detection limit to be 1.2Bq/g when the specific activity of uranium is 25000Bq/g, in these cases. We have confirmed that this new assay system is efficient for the rational classification of uranium wastes to be disposed of.

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© 2013 by Japan Radioisotope Association
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